Lo, B. (2010). GPS and geocaching in education (First edition.). International Society for Technology in Education.
Chicago-referens (17:e uppl.)Lo, Burt. GPS and Geocaching in Education. First edition. Eugene, Oregon: International Society for Technology in Education, 2010.
MLA-referens (9:e uppl.)Lo, Burt. GPS and Geocaching in Education. First edition. International Society for Technology in Education, 2010.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.